Preheat oven to 350°F. Lightly grease an 8x8 inch square pan.
Mix together butter, flour, and 2 tbsp brown sugar. Press into prepared pan. Bake for 15 mins in preheated oven.
Mix remaining ingredients together and pour filling over baked bottom layer. Bake for 20 mins in preheated oven. Serve warm with a scoop of vanilla ice cream!